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See detailA New Discontinuous Galerkin Formulation for Kirchhoff-Love Shells
Noels, Ludovic ULg; Radovitzky, Raul

Conference (2007)

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See detailA New Discontinuous Galerkin Formulation for Non-Linear Elasticity
Noels, Ludovic ULg; Chandran, Ram B; Radovitzky, Raul

Conference (2006)

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See detailA new discontinuous Galerkin method for Kirchhoff-Love shells
Noels, Ludovic ULg; Radovitzky, Raúl

in Computer Methods in Applied Mechanics & Engineering (2008), 197

Discontinuous Galerkin methods (DG) have particular appeal in problems involving high-order derivatives since they provide a means of weakly enforcing the continuity of the unknown-field derivatives. This ... [more ▼]

Discontinuous Galerkin methods (DG) have particular appeal in problems involving high-order derivatives since they provide a means of weakly enforcing the continuity of the unknown-field derivatives. This paper proposes a new discontinuous Galerkin method for Kirchhoff–Love shells considering only the membrane and bending response. The proposed one-field method utilizes the weak enforcement in such a way that the displacements are the only unknowns, while the rotation continuity is weakly enforced. This work presents the formulation of the new discontinuous Galerkin method for linear elastic shells, demonstrates the consistency and stability of the proposed framework, and establishes the method’s convergence rate. After a description of the formulation implementation into a finite-element code, these properties are demonstrated on numerical applications. [less ▲]

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See detailA new discontinuous Galerkin method for non-linear Mechanics
Noels, Ludovic ULg; Radovitzky, Raúl

(2006)

A discontinuous Galerkin framework for large deformations of solids is established. The method is based on a general Hu-Washizu-de Veubeke functional allowing for displacement and stress discontinuities ... [more ▼]

A discontinuous Galerkin framework for large deformations of solids is established. The method is based on a general Hu-Washizu-de Veubeke functional allowing for displacement and stress discontinuities in the domain interior. The focus of this paper is on the treatment of large elasto-plastic deformations. The method is shown to possess the required numerical properties: consistency in the non-linear range and linearized stability. In order to demonstrate the versatility, accuracy and robustness of the method examples of application and convergence studies in three dimensions are provided. Further developments of the method will lead to applications where physical discontinuities must be modeled like fragmentation or failure. [less ▲]

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See detailNew disruption cassettes for rapid gene disruption and marker rescue in the yeast Yarrowia lipolytica
Fickers, Patrick ULg; Le Dall, M. T.; Gaillardin, C. et al

in Journal of Microbiological Methods (2003), 55(3), 727-737

Yarrowia lipolytica is one of the most extensively studied nonconventional yeasts. Unfortunately, few methods for gene disruption have been reported for this yeast, and all of them are time-consuming and ... [more ▼]

Yarrowia lipolytica is one of the most extensively studied nonconventional yeasts. Unfortunately, few methods for gene disruption have been reported for this yeast, and all of them are time-consuming and laborious. The functional analysis of unknown genes requires powerful disruption methods. Here, we describe such a new method for rapid gene disruption in Y lipolytica. This knockout system combines SEP method and the Cre-lox recombination system, facilitating efficient marker rescue. Versatility was increased by using both auxotrophic markers like ylURA3 and ylLEU2, as well as the antibiotic resistance marker hph. The hph marker, which confers resistance to hygromycin-B, allows gene disruption in a strain lacking any conventional auxothrophic marker. The disruption cassette was shown to integrate at the correct locus at an average frequency of 45%. Upon expression of Cre recombinase, the marker was excised at a frequency of 98%, by recombination between the two lox sites. This new method for gene disruption is an ideal tool for the functional analysis of gene families, or for creating large-scale mutant collections in general. (C) 2003 Elsevier B.V. All rights reserved. [less ▲]

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See detailA new distribution of vegetation types and its inclusion in a global biosphere model
Warnand; François, Louis ULg; Nemry, B. et al

Poster (1995, August)

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See detailA new diterpene enone from the soldier beetle Cantharis livida (Coleoptera : Cantharidae)
Durvaux, Christophe; Laurent, Pascal ULg; Daloze, Désiré et al

in ARKIVOC (2007), 10

Cantharenone, a new diterpene structurally related to the prenylbisabolane skeleton, has been isolated from the beetle Cantharis livida (Cantharidae). Its structure has been determined on the basis of its ... [more ▼]

Cantharenone, a new diterpene structurally related to the prenylbisabolane skeleton, has been isolated from the beetle Cantharis livida (Cantharidae). Its structure has been determined on the basis of its spectral properties. This is the first report of such a type of diterpenoid from an insect. [less ▲]

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See detailNew diversity patterns of Triassic conodonts
Plasencia, Pablo; Martínez-Perez, Carlos; Cascales - Miñana, Borja ULg et al

Conference (2013, July)

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See detailNew drugs and nutraceuticals in the treatment of osteoarthritis
Henrotin, Yves ULg; Reginster, Jean-Yves ULg

in Cox Gad, Shayne (Ed.) Development of Therapeutic Agents Handbook (2012)

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See detailNew Dynamics in Female Migration and Integration
Martiniello, Marco ULg; Timmerman, C.; Rea, A. et al

Book published by Routledge - Routledge Research and Gender and Society (2015)

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See detailA new easy method for specific measurement of active myeloperoxidase in human biological fluids and tissue extracts
Franck, Thierry ULg; Kohnen, Stephan; Zouaoui Boudjeltia, Karim et al

in Talanta (2009), 80

The SIEFED (“Specific Immunological Extraction Followed by Enzymatic Detection”) method already developed for the specific detection of the activity of equine myeloperoxidase (MPO) was adapted for the ... [more ▼]

The SIEFED (“Specific Immunological Extraction Followed by Enzymatic Detection”) method already developed for the specific detection of the activity of equine myeloperoxidase (MPO) was adapted for the specific measurement of active human MPO in biological fluids or tissue extracts. [less ▲]

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See detailNew Economy, New Myths ? The American Media Industry in Perspective
Geuens, Geoffrey ULg

Scientific conference (2008, October 16)

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See detailNew efficient bicomponent organocatalysts for the chemical fixation of CO2 onto epoxides: a theoretical study
Alves, Margot ULg; Méreau, Raphaël; Grignard, Bruno ULg et al

Poster (2015, May 18)

Regarding the economic and environmental issues, valorising CO2 as a C1 feedstock for producing useful building blocks is seducing as it is a free and abundant waste resulting from the human activity ... [more ▼]

Regarding the economic and environmental issues, valorising CO2 as a C1 feedstock for producing useful building blocks is seducing as it is a free and abundant waste resulting from the human activity. Cyclic carbonates are useful compounds that found application as green solvents, electrolytes for lithium battery or monomers for polycarbonates or polyurethanes synthesis. These cyclocarbonates can be synthesized with a total atom economy by chemical fixation of CO2 onto epoxides using organometallic complexes or organocatalysts. To date, although this area of research has been the subject of many studies, the identification and development of (organo)catalysts highly efficient under mild experimental conditions still remains challenging. In this context, we developed a new organocatalytic platform based on the use of ammonium salts in combination with single or double hydrogen bond donor activators derived from fluorinated alcohols that showed unexpected booster effect. In this contribution, the ammonium/fluoroalcohol promoted CO2/propylene oxide coupling was investigated through detailed kinetic studies by IR spectroscopy under pressure and results were compared to the most efficient organocatalysts based on ammonium salts and (multi)phenolic derivatives that were reported in the literature. In order to finely understand the reaction mechanism, this study was completed by molecular modeling. DFT calculations showed that the addition of H-bond donors (HBD) with hexafluoroisopropanol functionalities modified the mechanism of the ammonium promoted coupling of CO2 with epoxides. HBDs dramatically decreased the epoxide ring-opening step barrier which highlights the key role of the fluorinated activators in stabilizing the intermediates and transitions states by inter- and intra-molecular hydrogen bonds. [less ▲]

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See detailNew efficient organocatalytic system for solvent-free chemical fixation of CO2 into epoxides
Panchireddy, Satyannarayana ULg; Gennen, Sandro ULg; Alves, Margot ULg et al

Poster (2015, September 11)

Due to concerns about global warming combined with the decrease of fossil resources, the chemical transformation of carbon dioxide (CO2) into added-value products has gained interest in both academic and ... [more ▼]

Due to concerns about global warming combined with the decrease of fossil resources, the chemical transformation of carbon dioxide (CO2) into added-value products has gained interest in both academic and industrial fields. To date, the chemical fixation of CO2 onto epoxides with the formation of cyclic carbonates (CC) is one of the most promising ways to valorise CO2 at an industrial scale. Indeed, CC are useful monomers for polycarbonate synthesis and they can react with primary amines to produce 2-hydroxyethylurethane. This reaction can be extrapolated to the synthesis of non-isocyanate polyurethanes (NIPUs) by a step growth polymerization between bifunctional CC and diamines. [less ▲]

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See detailA new elastic-visco-plastic damage model for annealed aluminium: theory, calibration and validation
Habraken, Anne ULg; Zhang, Lihong ULg; Wang, X. C. et al

in Benallal, A. (Ed.) Proceedings of the Continuous Damage and Fracture Symposium (2000)

This article describes an energy based, two variables, isotropic damage model merged with Bodner's elasto-visco-plastic model and implemented in a non-linear finite element code. The procedure to identify ... [more ▼]

This article describes an energy based, two variables, isotropic damage model merged with Bodner's elasto-visco-plastic model and implemented in a non-linear finite element code. The procedure to identify the parameters of the model and its experimental validation are presented and applied to an annealed aluminium. [less ▲]

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See detailNew elicitors as biocontrol tools to protect wheat against Septoria Tritici Blotch
Le Mire, Géraldine ULg; SIAH, Ali; Jijakli, Haissam ULg

Poster (2016, April)

Wheat is one of the most cultivated crops in the European Union. This cereal must however face important losses every year due to a major foliar disease known as Septoria Tritici Blotch (STB) caused by ... [more ▼]

Wheat is one of the most cultivated crops in the European Union. This cereal must however face important losses every year due to a major foliar disease known as Septoria Tritici Blotch (STB) caused by the fungus Zymoseptoria tritici. Disease control mainly depends on phytosanitary products. However, conventional agriculture is evolving towards more sustainable practices, out of respect for human health and the environment. Elicitors are considered as promising biological control tools and draw major interest in Integrated Pest Management strategies. These plant-immunity triggering compounds induce a general systemic resistance of the plant to a large spectrum of diseases. This study focuses on the screening of nine potential elicitors to protect winter wheat against Zymoseptoria tritici. Greenhouse trials were carried out to measure the ability of the different products to reduce disease foliar symptoms (necrosis, chlorosis and pycnidia). In addition, the biocide activity of these products towards the pathogen was evaluated under greenhouse and laboratory conditions. Furthermore, the modes of action of the best elicitors were investigated by studying the activity of some key defense enzymes of wheat. The corresponding results will be presented and discussed with the perspective to choose the two best elicitors for field trials and undertake further investigations on the signaling pathways triggered in the plant. [less ▲]

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See detailNew elicitors to protect wheat against Zymoseptoria tritici: biocontrol tools for IPM strategies
Le Mire, Géraldine ULg; SIAH, Ali; BRISSET, Marie-Noëlle et al

Conference (2016, May 17)

Elicitors are increasingly considered as promising biocontrol tools in the preventive treatment of plants against various diseases. These plant-immunity triggering compounds, also called “stimulators of ... [more ▼]

Elicitors are increasingly considered as promising biocontrol tools in the preventive treatment of plants against various diseases. These plant-immunity triggering compounds, also called “stimulators of plant natural defenses”, induce a general and systemic resistance of the plant to a large spectrum of biotic stresses. Today, focus is made on the crucial protection of wheat, as one of the most cultivated crop plants in the world. This crop is constantly challenged by a persistent and harmful fungus known as Zymoseptoria tritici, responsible of the Septoria Tritici Blotch (STB) disease. Control of this disease mainly depends on phytosanitary products, and the social and economic importance of wheat make it all the more urgent to identify and develop new elicitors as biocontrol tools in wheat IPM strategies. This study focuses on the screening of nine molecules of various origins and structures for their potential eliciting properties to protect winter wheat against Zymoseptoria tritici. Three products were selected after screening trials in greenhouse conditions: EGL1, EGL4, and EGL5. They were efficient to reduce foliar disease symptoms from 40 to 80%. The biocide activity and phytotoxicity of these 3 products were evaluated directly towards the pathogen and the plant under laboratory and greenhouse conditions, respectively. On the other hand, the triggered signaling pathways were investigated by studying the activity of the defense-related enzymes lipoxygenase (LOX), peroxidase (POX) and phenylalanine ammonia-lyase (PAL) in treated wheat leaves. In addition, the expression of five defense genes (lox, pal, pox2, chi, pr1) was studied by qRT-PCR in wheat leaves treated with these elicitors and/or inoculated with Zymoseptoria tritici. The corresponding results will be presented and discussed, with the perspective to investigate the influence of environmental parameters on the elicitation capacity and the efficacy of the elicitors in field conditions. [less ▲]

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See detailNew emission lines in Mira Ceti
Swings, Polydore ULg

in Publications of the Astronomical Society of the Pacific [=PASP] (1940), 52

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See detailNew Energy Levels in Ne II deduced from FTS spectra in the Infrared Region (1800-9000 cm-1)
Quinet, Pascal ULg; Palmeri, P.; Biémont, Emile ULg

in Physica Scripta (1994), 49

Detailed reference viewed: 9 (2 ULg)